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OC'n crossfire 5850 probs, need help

post #1 of 23
Thread Starter 
So basically here is my problem, i have 2 5850s, one HIS and one asus, individually they both clock fine to 1000/1300 but in crossfire i cant get past like 800ish/1150ish, even at that it like crashs and sometimes recovers. Else just goes all out. i havnt noticed many BSOD like others seem to, i just get like a brown sorta screen with lines going down. It cant be that voltage is 2 low cause i even tried putting 1.25 volts on the card and 1.3volts doing a simple clock like listed above. I am using msi afterburner.

Details.

I have disable ULPS
Both cards are referance design, they both have stock bios's so his and asus bios (could this be problem?) i was trying on catalyst 10.12 but now i updated to 11.2 (i think it is) same problem still.
I was origionally trying with cpu at 4.0ghz (i5 750) and i read somewhere to put it down to stock so i tried that (its stock clocks atm)
I flashed my motherboard bios to the latest and updated chipset drivers and so on but no luck.

Ive read its hard to OC crossfire cards but ive tried everything i can find and no luck.

pc specs listed in signature

Thanks
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post #2 of 23
What are your temps? Your driver is probably crashing.
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post #3 of 23
Thread Starter 
at about 1.2V with 850mhz and 1200mem or so im idle at 55-60ish and during the 1-2 mins i last in furmark, or 3dmark vantage i get up to around 75-77, but ive read that these can happily sit at 80 during stress. And that they cant go above 90 at all. Im on stock referance design air cooling.
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post #4 of 23
Low the memory, you're asking too much from those cards.
Even the 5870 reaching 1300 stable is a lot to ask for.
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post #5 of 23
Quote:
Originally Posted by grunion View Post
Low the memory, you're asking too much from those cards.
Even the 5870 reaching 1300 stable is a lot to ask for.
^This.
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post #6 of 23
Why such hefty overclocks?
CrossfireX 5850's is good muscle.

When I go SLi I aint gonna worry about setting records.
Stability and smoothness is my goal.
A little OC is ok but you don't need to kill it.

I think youre pushing it a little too far, not to mention 2 Cypress GPU's will eat some juice.
Whats your PSU?
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post #7 of 23
Thread Starter 
PSU is a Corsair TX850 (non modular), B4 crossfiring i was running one GPU stable at 1.3V, 950mhz core and 1275 Memory, so i am mainly trying to get these clocks again on the 2 GPUS so i can run a few benchmark's, see what its capable of then back it down to a more stable clock.
The RIG
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post #8 of 23
Thread Starter 
I just updated atferburner to 2.1.0 from 2.0.0 and now my first card which is an asus is unlocked but if i select GPU 2 in msi afterburner i cant go past 775mhz core and 1125 mem. Is this a bios issue? if so how come i didnt have it in msi afterburner 2.0.0? thx
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The RIG
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post #9 of 23
Thread Starter 
still no luck. Anyone else have any suggestions?
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The RIG
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post #10 of 23
It is definetely bios, His reference 5850 vs Asus refence 5850 has different bioses(Asus is Voltage Tweak so has different bios).

Get the bios from Asus 5850 via GPU-Z or any other tool and flash that bios to His one, all your problems will be gone(or at least you'll be able to oc more than you can but that does not necessarily mean that you can achieve the same oc as a single card).

Btw even though it is known, if the process of flashing your card interrupted by any means or by any other complication your card probably will die, so responsibility is yours here
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